In Cleaning Oiled Marshlands, A Sea Of Unknowns | NPR

Credit: Alyson Hurt/NPR

On a coastal marsh south of New Orleans, oil still saturates a 30-foot-wide stretch. Where hip-high grass should be, the oil has formed a hard, dark mat. If you dig though that crust, you find a thick, oozy layer of oil. "It hasn't weathered or degraded much since it came ashore in early June," says scientist Scott Zengel, a contractor for the National Oceanic and Atmospheric Administration, who is overseeing the marsh survey crews...

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